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Finding the Fourth Proportional to 787.14, 1,086.94 and 578.50

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Solution

The fourth proportional to 787.14, 1,086.94 and 578.50 is: 798.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    787.14 : 1,086.94 = 578.50 : x
  2. Step 2: Convert to fraction form
    787.14/1,086.94 = 578.50/x
  3. Step 3: Cross multiply
    787.14x = 1,086.94 × 578.50
  4. Step 4: Simplify right side
    787.14x = 628,794.79
  5. Step 5: Solve for x
    x = 628,794.79/787.14
  6. Step 6: Final answer
    x = 798.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.